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Income Tax Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of income tax expense      
Current tax expense (benefit) $ 189,000 $ 42,000 $ (8,000)
Deferred tax expense (benefit) (2,663,000) 1,801,000 (155,000)
Total income tax expense (benefit) (2,474,000) 1,843,000 $ (163,000)
Deferred tax liabilities      
Net deferred tax (benefits) liabilities 2,540,000 $ 3,791,000  
Unrecognized Tax Benefits $ 0    
Texas      
Components of income tax expense      
Texas margin tax (as a percent) 0.75%    
Minimum tax base (as a percent) 70.00%